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Goofs

Revealing mistakes 

The Trilobites scuttling across the sea floor often don't disturb the sand grains, nor do they leave prints in the sand.
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Jump to: Anachronisms (1) | Factual errors (4) | Revealing mistakes (13) | Spoilers (6)

Anachronisms 

The Cephalaspis actually lived in the Devonian, not in the Silurian period.
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Factual errors 

Despite the fact that Cephalaspis are stated and shown to be bad swimmers, they swim surprisingly well when they migrate through the sea. They should swim lower to the sea bottom in this scene.
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The Hynerpeton is constantly making roar-like sounds. It is highly doubtful the animal was capable of emitting such noises in real life. Or even if it was, roaring non-stop would still be an unrealistic thing for an animal to do.
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The Brontoscorpio molts on dry land. It was probably more likely to shed its outer shell in the water, since, being a water-going animal, it would risk dehydration on land.
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Even some arthropods make strange, creaking sounds with their mouths. Most likely, these animals were silent, like modern day arthropods.
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Revealing mistakes 

When the two Animalocaris fight, for a moment a strange, light-toned shape appears on the screen just over them, then disappears between frames.
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As a Pterygotus swims past, above the camera's view, there is a thin line directly on the top of the screen, where you can see the background through the Pterygotus.
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When the female Cephalaspis jets out of view, escaping from the Brontoscorpio, she starts to disappear before she reaches the edge of the screen. If you freeze-frame here (though the error is visible without freeze-framing), you can see that her upper portion has been "cropped off", and you can clearly see the background through her.
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One shot has a couple of Cephalaspis swimming by who have no shadows. All the Cephalaspis that follow, however, do cast shadows on the sea floor.
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When the scorpions are mauling the Cephalaspis, many of the fish jumping out of the sea aren't reflected in the water. Also in one shot, the reflection of the Brontoscorpio approaching the scene from the background is rendered in such a way, it makes it look like the animal's floating a feet or two above the ground.
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As the victorious Animalocaris snaps the shell of its adversary, it pulls its head back so much that its appendages actually pass into the other animal's head for a moment.
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When we first get to see the female Cephalaspis, her shadow is animated as if the seabed under her is a flat surface, when she's actually swimming above the edge of a small rock-perch.
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When the Brontoscorpio chases after the Cephalaspis, the scorpion's animated as if it walked over a smaller outcropping on its way down the seabed's incline, but there is no such outcropping visible, making it look like the Brontosorpio sank into the incline for a second.
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In several underwater shots, the shadows cast by the CGI animals are grey, even though the shadows cast by the real-life objects are blue.
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When the Pterygotus rises out of the sand, the legs clearly clip through the ground without disturbing the sand.
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After the Pterygotus babies gather around their mother, her tail clearly clips into the ocean floor for a moment.
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When the Hyneria bumps into a log with its tailfin, the CGI animal is somewhat erroneously inserted into the footage. If you look at its tailfin, a small part of the log it's hitting disappears and reappears around its fin.
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After the Pterygotus has killed the Brontoscorpio and starts breaking it to pieces, the pieces drift down behind the Pterygotus, but land in front of it. The animators forgot to put the CGI Pterygotus behind the Brontoscorpio pieces as they fall to the ocean floor.
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Spoilers

The goof item below may give away important plot points.

Revealing mistakes 

As the Hyneria throws the Hynerpeton back into the water, a strange black shape juts out of the side of its head, then disappears back into it. It appears as though the CGI Hynerpeton's tail clipped though Hyneria's head.
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As the Pterygotus grabs the Brontoscorpio, its claw doesn't cast a shadow on the scorpion's body.
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When the Hyneria pulls herself onto land, her body very clearly clips into the ground.
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During the Hynearia's attack on the Hynerpeton pair, there are a couple of rocks lying on the ground, but the shadow the male Hynerpeton casts on them is rendered completely flat.
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When the Hyneria drags the Hynerpeton into the lake, just before it swims out of frame, the entire tail of the Hynerpeton visibly clips through the fish's forehead. Also in this shot, the waves and splashes on the surface of the water are moving almost in slow-motion with a very low frame-rate, revealing they've been only added digitally onto it.
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When the Hyneria comes out of the water, there is a strange, brown-shaped "blob" on the rocks moving on the screen's bottom, likely the remnant of a CGI composition error.
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